Spokane Valley, Washington has a Humid Continental Climate - Dry Cool Summer climate (Köppen classification: Dsb). Average annual temperatures range from 38 °F (low) to 59.7 °F (high). Annual precipitation averages 18.6 Inches. Spokane Valley is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 25.7 °F | 36.7 °F | 2.24 in. |
| February | 26.4 °F | 41.6 °F | 1.56 in. |
| March | 30.6 °F | 50.1 °F | 1.94 in. |
| April | 35.7 °F | 58.2 °F | 1.48 in. |
| May | 42.9 °F | 68.0 °F | 1.77 in. |
| June | 49.1 °F | 74.5 °F | 1.52 in. |
| July | 53.9 °F | 85.1 °F | 0.58 in. |
| August | 53.0 °F | 85.2 °F | 0.55 in. |
| September | 45.3 °F | 75.3 °F | 0.59 in. |
| October | 36.8 °F | 60.0 °F | 1.54 in. |
| November | 30.6 °F | 44.9 °F | 2.24 in. |
| December | 25.6 °F | 36.2 °F | 2.56 in. |
| Annual | 38 °F | 59.7 °F | 18.57 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 7a : 0°F to 5°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dsb - Humid Continental Climate - Dry Cool Summer |